What kind of sensor could you make  to build a magnetometer to monitor magnetic
anomalies? What kind of period would you look for?
Peter

Arie Verveer wrote:

> Hi ,  After Ed's suggestion on the infra sound possibility, I did some more
> investigation
> on the 'noise' spike when the  Molniya 1-67,  Russian  communications satellite
> re-entered
> above my location. (27th Jan 2000 at 14:50:28 UT).  I checked the professional
> Seismometers
> via an AutoDrm request,  and this  showed no event.  Then as the final check I
> looked
> at the magnet recordings form a  magnetic observatory some 900 km away.
>
> Bingo, at the time of my observation there is a distinct spike in the magnetic
> records at
> 14:50UT. All three  component's of the magnetic field showed  the effect. That data
> is
> available for the next week or so at:
>
> ftp://ftp.ips.gov.au/asfc/data/mag/lea/rawdata/images/learaw.000127.gif
>
> I cant explain what caused the effect but it looks very interesting against the
> seismometer
> recordings and the visual observation.
>
> Arie
>
> Ed Thelen wrote:
>
> > I knew  a guy who lived under the landing pattern for Los Angles
> > International air port.  He ran a garden gate type seismograph
> > adjusted to about 20 seconds natural period.  He said that
> > even though it was in a little shed in the back yard,
> > the seismograph had to be carefully covered with a good box
> > or he would be affected by planes flying low overhead.
> >
> > Could there have been an non-audible pressure wave from the
> > fireball that pushed the boom  of the seismometer a tiny bit?
> >
> > I don't know if a shock wave from say 50 Km high event
> > (presumably a very audible sharp step in pressure)
> > gets converted to a slow rising pressure wave that
> > humans don't hear at ground level.
> >
> > (I do know that a supersonic Hustler bomber flying at
> >  say 30,000 feet makes a very audible window rattling
> >  "BOOM" at ground level.)
>
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